| Complete Marine Solutions Ltd | Manufacturing | 2016 |
| Complete Signs Ltd | Manufacturing | 2020 |
| Complete Solutions (Dorset) Limited | Construction | 2008 |
| Complete Solutions (Europe) Limited | Construction | 2003 |
| Complete Tree Management Limited | Administrative & support | 2022 |
| Completely Safety Ltd | Professional & scientific | 2024 |
| Complyiq Ltd | Information & communication | 2026 |
| Compound Audio Limited | Extraterritorial | 2005 |
| Compower Ltd | Wholesale & retail | 2026 |
| Compton Grove Management Company Limited | Households | 1999 |
| Comquip Ltd | Wholesale & retail | 2008 |
| Conbridge Stone Limited | Real estate | 2025 |
| Concept Construction Southern Ltd | Construction | 2021 |
| Concept Expeditions Ltd | Administrative & support | 2025 |
| Concept Glazing Limited | Construction | 2021 |
| Conception Holdings Limited | Financial services | 2017 |
| Concrete Spectrum Solutions Ltd | Construction | 2023 |
| Conference Desk Agency Ltd | Administrative & support | 2025 |
| Confident Mind Limited | Education | 2024 |
| Configuration Management Consulting Ltd | Professional & scientific | 2013 |
| Coniam Construction Consultancy Ltd | Professional & scientific | 2025 |
| Conifer Lodge Management Limited | Households | 1999 |
| Conjurer Solutions Limited | Information & communication | 2007 |
| Conker Group Limited | Professional & scientific | 2018 |
| Conker Spirit Limited | Manufacturing | 2014 |
| Conker Spirit Properties Limited | Administrative & support | 2018 |
| Connaught Windows Ltd | Other services | 1995 |
| Connect 31 Limited | Transport & logistics | 2017 |
| Connect P&H Limited | Construction | 2013 |
| Connect Software Limited | Real estate | 1987 |
| Connected Companion Pet Care Ltd | Other services | 2026 |
| Connected State Limited | Professional & scientific | 2024 |
| Connecting Families Limited | Health & social care | 2023 |
| Connecting Families Residentials Limited | Health & social care | 2024 |
| Connecting Families Sexual Harm Service Limited | Health & social care | 2024 |
| Connecting Support Solutions Limited | Administrative & support | 2026 |
| Connectron Ltd | Professional & scientific | 2022 |
| Connell Yacht Consultancy Limited | Professional & scientific | 2021 |
| Connelly Management Ltd | Real estate | 2022 |
| Conquest Neuro Services Limited | Health & social care | 2024 |
| Consensus Employment Law Limited | Professional & scientific | 2012 |
| Conservatory Options Ltd | Construction | 2019 |
| Consilium Management Ltd | Information & communication | 2014 |
| Consortium Group Limited Partnership | | 2016 |
| Construction Solutions Pro Limited | Construction | 2026 |
| Consult Care Limited | Health & social care | 2023 |
| Consult on Ltd | Professional & scientific | 2025 |
| Consultancy 4 Business Limited | Professional & scientific | 2008 |
| Consumer Contact Limited | Wholesale & retail | 2019 |
| Consumer Electronics Equipment Distribution Ltd | Wholesale & retail | 2013 |
| Contentious Capacity Solutions Ltd | Health & social care | 2016 |
| Continental Clothing Company Limited | Wholesale & retail | 1998 |
| Continox Ltd | Construction | 2016 |
| Contract Smart Limited | Extraterritorial | 2007 |
| Contractor Friendly Mortgages Limited | Financial services | 2017 |
| Conversion Factory Ltd. | Information & communication | 2007 |
| Convert Pickleball Ltd | Wholesale & retail | 2024 |
| Coocoosqueaky Ltd | Information & communication | 2016 |
| Cool Control Ltd | Construction | 2004 |
| Cool Home Improvements Ltd | Construction | 2009 |
| Cool Home Ventures Limited | Real estate | 2017 |
| Cool Homes Limited | Construction | 2015 |
| Cool IT Couriers Limited | Transport & logistics | 2014 |
| Coolamon Property Limited | Real estate | 2022 |
| Coolboxworld Ltd | Wholesale & retail | 2025 |
| Coolmain Properties Limited | Real estate | 2026 |
| Coombe Wood (Management) Limited | Households | 1983 |
| Coomber Associates Limited | Professional & scientific | 2017 |
| Coope and Gosling Carpentry and Building Limited | Construction | 2021 |
| Cooperage Property Limited | Households | 2024 |
| Coopers Close (Wareham) Limited | Households | 1969 |
| Coord Healthcare Recruitment Ltd | Health & social care | 2021 |
| Coppen Court Freeholders Ltd | Households | 2025 |
| Copper Horse Limited | Information & communication | 2011 |
| Coppercore Construction Limited | Construction | 2016 |
| Copperglade Management Limited | Households | 2016 |
| Coppins (Bournemouth) Management Company Limited | Households | 1999 |
| Coppins Freehold Limited | Households | 2017 |
| Copy by Dave Ltd | Administrative & support | 2018 |
| Cora Tradings Limited | Wholesale & retail | 2018 |
| Coral Court Flat Management Company Limited | Households | 1978 |
| Coral Court Freehold Limited | Households | 2011 |
| Coral Point Poole Ltd | Households | 2007 |
| Corales Therapy Ltd | Administrative & support | 2013 |
| Coras Wholesale Ltd | Wholesale & retail | 2025 |
| Corbin House Management Company Limited | Households | 2017 |
| Core Accounting Solutions Ltd | Professional & scientific | 2020 |
| Core Planning Services Ltd | Professional & scientific | 2013 |
| Core Value Recruitment Limited | Administrative & support | 2025 |
| Coredog Ltd | Other services | 2025 |
| Corfe Castle Model Village Ltd | Hospitality | 2018 |
| Corfe Mullen Development Company Limited | Construction | 1960 |
| Corfe Park Flats Limited | Households | 1980 |
| Corfu Flats(Management)Company Limited | Households | 1964 |
| Corhaven Sheet Metal Fabrications Limited | Manufacturing | 2003 |
| Cori Javid Ltd | Administrative & support | 2018 |
| Coriander Cash & Carry Limited | Wholesale & retail | 2019 |
| Cork and Lobster Limited | Hospitality | 2021 |
| Corner Plot Development Ltd | Real estate | 2022 |
| Cornerstone Blue Ltd | Wholesale & retail | 2026 |